Equation (REF ) shows how a positron beam, together with measurements with electrons, provides a way to separate without any assumptions the DVCS\(^2\)  and BH-DVCS interference contributions to the cross section. With electrons alone, the only approach to this separation is to use the different beam energy dependence of the DVCS\(^2\)  and BH-DVCS interference. This is the strategy that will be used in approved experiment E12-13-010. However, as recent results have shown [1]} this technique has limitations due to the need to include power corrections to fully describe the precise azimuthal dependence of the DVCS cross sections.
